1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceOop.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/atomic.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/bitMap.inline.hpp"
40 #include "utilities/macros.hpp"
41 #if INCLUDE_JFR
42 #include "jfr/support/jfrKlassExtension.hpp"
43 #endif
44
45 // An InstanceKlass is the VM level representation of a Java class.
46 // It contains all information needed for at class at execution runtime.
47
48 // InstanceKlass layout:
49 // [C++ vtbl pointer ] Klass
50 // [subtype cache ] Klass
51 // [instance size ] Klass
52 // [java mirror ] Klass
53 // [super ] Klass
54 // [access_flags ] Klass
55 // [name ] Klass
56 // [first subklass ] Klass
57 // [next sibling ] Klass
58 // [array klasses ]
59 // [methods ]
60 // [local interfaces ]
61 // [transitive interfaces ]
62 // [fields ]
63 // [constants ]
64 // [class loader ]
65 // [source file name ]
66 // [inner classes ]
67 // [static field size ]
68 // [nonstatic field size ]
69 // [static oop fields size ]
70 // [nonstatic oop maps size ]
71 // [has finalize method ]
72 // [deoptimization mark bit ]
73 // [initialization state ]
74 // [initializing thread ]
75 // [Java vtable length ]
76 // [oop map cache (stack maps) ]
77 // [EMBEDDED Java vtable ] size in words = vtable_len
78 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
79 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
80 // indicating where oops are located in instances of this klass.
81 // [EMBEDDED implementor of the interface] only exist for interface
82 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
83
84
85 // forward declaration for class -- see below for definition
86 class SuperTypeClosure;
87 class JNIid;
88 class jniIdMapBase;
89 class BreakpointInfo;
90 class fieldDescriptor;
91 class DepChange;
92 class nmethodBucket;
93 class JvmtiCachedClassFieldMap;
94 class MemberNameTable;
95
96 // This is used in iterators below.
97 class FieldClosure: public StackObj {
98 public:
99 virtual void do_field(fieldDescriptor* fd) = 0;
100 };
101
102 #ifndef PRODUCT
103 // Print fields.
104 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
105 class FieldPrinter: public FieldClosure {
106 oop _obj;
107 outputStream* _st;
108 public:
FieldPrinter(outputStream * st,oop obj=NULL)109 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
110 void do_field(fieldDescriptor* fd);
111 };
112 #endif // !PRODUCT
113
114 // ValueObjs embedded in klass. Describes where oops are located in instances of
115 // this klass.
116 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
117 public:
118 // Byte offset of the first oop mapped by this block.
offset() const119 int offset() const { return _offset; }
set_offset(int offset)120 void set_offset(int offset) { _offset = offset; }
121
122 // Number of oops in this block.
count() const123 uint count() const { return _count; }
set_count(uint count)124 void set_count(uint count) { _count = count; }
125
126 // sizeof(OopMapBlock) in HeapWords.
size_in_words()127 static const int size_in_words() {
128 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
129 LogHeapWordSize;
130 }
131
132 private:
133 int _offset;
134 uint _count;
135 };
136
137 struct JvmtiCachedClassFileData;
138
139 class InstanceKlass: public Klass {
140 friend class VMStructs;
141 friend class ClassFileParser;
142 friend class CompileReplay;
143
144 protected:
145 // Constructor
146 InstanceKlass(int vtable_len,
147 int itable_len,
148 int static_field_size,
149 int nonstatic_oop_map_size,
150 ReferenceType rt,
151 AccessFlags access_flags,
152 bool is_anonymous);
153 public:
154 static InstanceKlass* allocate_instance_klass(
155 ClassLoaderData* loader_data,
156 int vtable_len,
157 int itable_len,
158 int static_field_size,
159 int nonstatic_oop_map_size,
160 ReferenceType rt,
161 AccessFlags access_flags,
162 Symbol* name,
163 Klass* super_klass,
164 bool is_anonymous,
165 TRAPS);
166
InstanceKlass()167 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
168
169 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
170 // of the class loading & initialization procedure, and the use of the states.
171 enum ClassState {
172 allocated, // allocated (but not yet linked)
173 loaded, // loaded and inserted in class hierarchy (but not linked yet)
174 linked, // successfully linked/verified (but not initialized yet)
175 being_initialized, // currently running class initializer
176 fully_initialized, // initialized (successfull final state)
177 initialization_error // error happened during initialization
178 };
179
number_of_instance_classes()180 static int number_of_instance_classes() { return _total_instanceKlass_count; }
181
182 private:
183 static volatile int _total_instanceKlass_count;
184
185 protected:
186 // Annotations for this class
187 Annotations* _annotations;
188 // Array classes holding elements of this class.
189 Klass* _array_klasses;
190 // Constant pool for this class.
191 ConstantPool* _constants;
192 // The InnerClasses attribute and EnclosingMethod attribute. The
193 // _inner_classes is an array of shorts. If the class has InnerClasses
194 // attribute, then the _inner_classes array begins with 4-tuples of shorts
195 // [inner_class_info_index, outer_class_info_index,
196 // inner_name_index, inner_class_access_flags] for the InnerClasses
197 // attribute. If the EnclosingMethod attribute exists, it occupies the
198 // last two shorts [class_index, method_index] of the array. If only
199 // the InnerClasses attribute exists, the _inner_classes array length is
200 // number_of_inner_classes * 4. If the class has both InnerClasses
201 // and EnclosingMethod attributes the _inner_classes array length is
202 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
203 Array<jushort>* _inner_classes;
204
205 // the source debug extension for this klass, NULL if not specified.
206 // Specified as UTF-8 string without terminating zero byte in the classfile,
207 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
208 char* _source_debug_extension;
209 // Array name derived from this class which needs unreferencing
210 // if this class is unloaded.
211 Symbol* _array_name;
212
213 // Number of heapOopSize words used by non-static fields in this klass
214 // (including inherited fields but after header_size()).
215 int _nonstatic_field_size;
216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
217 // Constant pool index to the utf8 entry of the Generic signature,
218 // or 0 if none.
219 u2 _generic_signature_index;
220 // Constant pool index to the utf8 entry for the name of source file
221 // containing this klass, 0 if not specified.
222 u2 _source_file_name_index;
223 u2 _static_oop_field_count;// number of static oop fields in this klass
224 u2 _java_fields_count; // The number of declared Java fields
225 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
226
227 // _is_marked_dependent can be set concurrently, thus cannot be part of the
228 // _misc_flags.
229 bool _is_marked_dependent; // used for marking during flushing and deoptimization
230 bool _is_being_redefined; // used for locking redefinition
231 bool _has_unloaded_dependent;
232
233 enum {
234 _misc_rewritten = 1 << 0, // methods rewritten.
235 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
236 _misc_should_verify_class = 1 << 2, // allow caching of preverification
237 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
238 _misc_is_contended = 1 << 4, // marked with contended annotation
239 _misc_has_default_methods = 1 << 5, // class/superclass/implemented interfaces has default methods
240 _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access)
241 _misc_has_been_redefined = 1 << 7 // class has been redefined
242 };
243 u2 _misc_flags;
244 u2 _minor_version; // minor version number of class file
245 u2 _major_version; // major version number of class file
246 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
247 int _vtable_len; // length of Java vtable (in words)
248 int _itable_len; // length of Java itable (in words)
249 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
250 MemberNameTable* _member_names; // Member names
251 JNIid* _jni_ids; // First JNI identifier for static fields in this class
252 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
253 nmethodBucket* _dependencies; // list of dependent nmethods
254 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
255 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
256 // Linked instanceKlasses of previous versions
257 InstanceKlass* _previous_versions;
258 // JVMTI fields can be moved to their own structure - see 6315920
259 // JVMTI: cached class file, before retransformable agent modified it in CFLH
260 JvmtiCachedClassFileData* _cached_class_file;
261
262 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
263
264 // Class states are defined as ClassState (see above).
265 // Place the _init_state here to utilize the unused 2-byte after
266 // _idnum_allocated_count.
267 u1 _init_state; // state of class
268 u1 _reference_type; // reference type
269
270 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
271
272 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
273
274 // Method array.
275 Array<Method*>* _methods;
276 // Default Method Array, concrete methods inherited from interfaces
277 Array<Method*>* _default_methods;
278 // Interface (Klass*s) this class declares locally to implement.
279 Array<Klass*>* _local_interfaces;
280 // Interface (Klass*s) this class implements transitively.
281 Array<Klass*>* _transitive_interfaces;
282 // Int array containing the original order of method in the class file (for JVMTI).
283 Array<int>* _method_ordering;
284 // Int array containing the vtable_indices for default_methods
285 // offset matches _default_methods offset
286 Array<int>* _default_vtable_indices;
287
288 // Instance and static variable information, starts with 6-tuples of shorts
289 // [access, name index, sig index, initval index, low_offset, high_offset]
290 // for all fields, followed by the generic signature data at the end of
291 // the array. Only fields with generic signature attributes have the generic
292 // signature data set in the array. The fields array looks like following:
293 //
294 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
295 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
296 // ...
297 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
298 // [generic signature index]
299 // [generic signature index]
300 // ...
301 Array<u2>* _fields;
302
303 // embedded Java vtable follows here
304 // embedded Java itables follows here
305 // embedded static fields follows here
306 // embedded nonstatic oop-map blocks follows here
307 // embedded implementor of this interface follows here
308 // The embedded implementor only exists if the current klass is an
309 // iterface. The possible values of the implementor fall into following
310 // three cases:
311 // NULL: no implementor.
312 // A Klass* that's not itself: one implementor.
313 // Itself: more than one implementors.
314 // embedded host klass follows here
315 // The embedded host klass only exists in an anonymous class for
316 // dynamic language support (JSR 292 enabled). The host class grants
317 // its access privileges to this class also. The host class is either
318 // named, or a previously loaded anonymous class. A non-anonymous class
319 // or an anonymous class loaded through normal classloading does not
320 // have this embedded field.
321 //
322
323 friend class SystemDictionary;
324
325 public:
has_nonstatic_fields() const326 bool has_nonstatic_fields() const {
327 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
328 }
set_has_nonstatic_fields(bool b)329 void set_has_nonstatic_fields(bool b) {
330 if (b) {
331 _misc_flags |= _misc_has_nonstatic_fields;
332 } else {
333 _misc_flags &= ~_misc_has_nonstatic_fields;
334 }
335 }
336
337 // field sizes
nonstatic_field_size() const338 int nonstatic_field_size() const { return _nonstatic_field_size; }
set_nonstatic_field_size(int size)339 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
340
static_field_size() const341 int static_field_size() const { return _static_field_size; }
set_static_field_size(int size)342 void set_static_field_size(int size) { _static_field_size = size; }
343
static_oop_field_count() const344 int static_oop_field_count() const { return (int)_static_oop_field_count; }
set_static_oop_field_count(u2 size)345 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
346
347 // Java vtable
vtable_length() const348 int vtable_length() const { return _vtable_len; }
set_vtable_length(int len)349 void set_vtable_length(int len) { _vtable_len = len; }
350
351 // Java itable
itable_length() const352 int itable_length() const { return _itable_len; }
set_itable_length(int len)353 void set_itable_length(int len) { _itable_len = len; }
354
355 // array klasses
array_klasses() const356 Klass* array_klasses() const { return _array_klasses; }
set_array_klasses(Klass * k)357 void set_array_klasses(Klass* k) { _array_klasses = k; }
358
359 // methods
methods() const360 Array<Method*>* methods() const { return _methods; }
set_methods(Array<Method * > * a)361 void set_methods(Array<Method*>* a) { _methods = a; }
362 Method* method_with_idnum(int idnum);
363 Method* method_with_orig_idnum(int idnum);
364 Method* method_with_orig_idnum(int idnum, int version);
365
366 // method ordering
method_ordering() const367 Array<int>* method_ordering() const { return _method_ordering; }
set_method_ordering(Array<int> * m)368 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
369 void copy_method_ordering(intArray* m, TRAPS);
370
371 // default_methods
default_methods() const372 Array<Method*>* default_methods() const { return _default_methods; }
set_default_methods(Array<Method * > * a)373 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
374
375 // default method vtable_indices
default_vtable_indices() const376 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
set_default_vtable_indices(Array<int> * v)377 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
378 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
379
380 // interfaces
local_interfaces() const381 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
set_local_interfaces(Array<Klass * > * a)382 void set_local_interfaces(Array<Klass*>* a) {
383 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
384 _local_interfaces = a; }
385
transitive_interfaces() const386 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
set_transitive_interfaces(Array<Klass * > * a)387 void set_transitive_interfaces(Array<Klass*>* a) {
388 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
389 _transitive_interfaces = a;
390 }
391
392 private:
393 friend class fieldDescriptor;
field(int index) const394 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
395
396 public:
field_offset(int index) const397 int field_offset (int index) const { return field(index)->offset(); }
field_access_flags(int index) const398 int field_access_flags(int index) const { return field(index)->access_flags(); }
field_name(int index) const399 Symbol* field_name (int index) const { return field(index)->name(constants()); }
field_signature(int index) const400 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
401
402 // Number of Java declared fields
java_fields_count() const403 int java_fields_count() const { return (int)_java_fields_count; }
404
fields() const405 Array<u2>* fields() const { return _fields; }
set_fields(Array<u2> * f,u2 java_fields_count)406 void set_fields(Array<u2>* f, u2 java_fields_count) {
407 guarantee(_fields == NULL || f == NULL, "Just checking");
408 _fields = f;
409 _java_fields_count = java_fields_count;
410 }
411
412 // inner classes
inner_classes() const413 Array<u2>* inner_classes() const { return _inner_classes; }
set_inner_classes(Array<u2> * f)414 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
415
416 enum InnerClassAttributeOffset {
417 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
418 inner_class_inner_class_info_offset = 0,
419 inner_class_outer_class_info_offset = 1,
420 inner_class_inner_name_offset = 2,
421 inner_class_access_flags_offset = 3,
422 inner_class_next_offset = 4
423 };
424
425 enum EnclosingMethodAttributeOffset {
426 enclosing_method_class_index_offset = 0,
427 enclosing_method_method_index_offset = 1,
428 enclosing_method_attribute_size = 2
429 };
430
431 // method override check
432 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
433
434 // package
435 bool is_same_class_package(Klass* class2);
436 bool is_same_class_package(oop classloader2, Symbol* classname2);
437 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
438
439 // find an enclosing class (defined where original code was, in jvm.cpp!)
compute_enclosing_class(bool * inner_is_member,TRAPS)440 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
441 instanceKlassHandle self(THREAD, this);
442 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
443 }
444 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
445 bool* inner_is_member, TRAPS);
446
447 // tell if two classes have the same enclosing class (at package level)
is_same_package_member(Klass * class2,TRAPS)448 bool is_same_package_member(Klass* class2, TRAPS) {
449 instanceKlassHandle self(THREAD, this);
450 return is_same_package_member_impl(self, class2, THREAD);
451 }
452 static bool is_same_package_member_impl(instanceKlassHandle self,
453 Klass* class2, TRAPS);
454
455 // initialization state
is_loaded() const456 bool is_loaded() const { return _init_state >= loaded; }
is_linked() const457 bool is_linked() const { return _init_state >= linked; }
is_initialized() const458 bool is_initialized() const { return _init_state == fully_initialized; }
is_not_initialized() const459 bool is_not_initialized() const { return _init_state < being_initialized; }
is_being_initialized() const460 bool is_being_initialized() const { return _init_state == being_initialized; }
is_in_error_state() const461 bool is_in_error_state() const { return _init_state == initialization_error; }
is_reentrant_initialization(Thread * thread)462 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
init_state()463 ClassState init_state() { return (ClassState)_init_state; }
is_rewritten() const464 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
465
466 // defineClass specified verification
should_verify_class() const467 bool should_verify_class() const {
468 return (_misc_flags & _misc_should_verify_class) != 0;
469 }
set_should_verify_class(bool value)470 void set_should_verify_class(bool value) {
471 if (value) {
472 _misc_flags |= _misc_should_verify_class;
473 } else {
474 _misc_flags &= ~_misc_should_verify_class;
475 }
476 }
477
478 // marking
is_marked_dependent() const479 bool is_marked_dependent() const { return _is_marked_dependent; }
set_is_marked_dependent(bool value)480 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
481
has_unloaded_dependent() const482 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
set_has_unloaded_dependent(bool value)483 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
484
485 // initialization (virtuals from Klass)
486 bool should_be_initialized() const; // means that initialize should be called
487 void initialize(TRAPS);
488 void link_class(TRAPS);
489 bool link_class_or_fail(TRAPS); // returns false on failure
490 void unlink_class();
491 void rewrite_class(TRAPS);
492 void link_methods(TRAPS);
493 Method* class_initializer();
494
495 // set the class to initialized if no static initializer is present
496 void eager_initialize(Thread *thread);
497
498 // reference type
reference_type() const499 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
set_reference_type(ReferenceType t)500 void set_reference_type(ReferenceType t) {
501 assert(t == (u1)t, "overflow");
502 _reference_type = (u1)t;
503 }
504
reference_type_offset()505 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
506
507 // find local field, returns true if found
508 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
509 // find field in direct superinterfaces, returns the interface in which the field is defined
510 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
511 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
512 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
513 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
514 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
515
516 // find a non-static or static field given its offset within the class.
contains_field_offset(int offset)517 bool contains_field_offset(int offset) {
518 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
519 }
520
521 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
522 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
523
524 // find a local method (returns NULL if not found)
525 Method* find_method(Symbol* name, Symbol* signature) const;
526 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
527
528 // find a local method, but skip static methods
529 Method* find_instance_method(Symbol* name, Symbol* signature,
530 PrivateLookupMode private_mode);
531 static Method* find_instance_method(Array<Method*>* methods,
532 Symbol* name, Symbol* signature,
533 PrivateLookupMode private_mode);
534
535 // find a local method (returns NULL if not found)
536 Method* find_local_method(Symbol* name, Symbol* signature,
537 OverpassLookupMode overpass_mode,
538 StaticLookupMode static_mode,
539 PrivateLookupMode private_mode) const;
540
541 // find a local method from given methods array (returns NULL if not found)
542 static Method* find_local_method(Array<Method*>* methods,
543 Symbol* name, Symbol* signature,
544 OverpassLookupMode overpass_mode,
545 StaticLookupMode static_mode,
546 PrivateLookupMode private_mode);
547
548 // true if method matches signature and conforms to skipping_X conditions.
549 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
550
551 // find a local method index in methods or default_methods (returns -1 if not found)
552 static int find_method_index(Array<Method*>* methods,
553 Symbol* name, Symbol* signature,
554 OverpassLookupMode overpass_mode,
555 StaticLookupMode static_mode,
556 PrivateLookupMode private_mode);
557
558
559 // lookup operation (returns NULL if not found)
560 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
561
562 // lookup a method in all the interfaces that this class implements
563 // (returns NULL if not found)
564 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
565
566 // lookup a method in local defaults then in all interfaces
567 // (returns NULL if not found)
568 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
569
570 // Find method indices by name. If a method with the specified name is
571 // found the index to the first method is returned, and 'end' is filled in
572 // with the index of first non-name-matching method. If no method is found
573 // -1 is returned.
574 int find_method_by_name(Symbol* name, int* end);
575 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
576
577 // constant pool
constants() const578 ConstantPool* constants() const { return _constants; }
set_constants(ConstantPool * c)579 void set_constants(ConstantPool* c) { _constants = c; }
580
581 // protection domain
582 oop protection_domain() const;
583
584 // signers
585 objArrayOop signers() const;
586
587 // host class
host_klass() const588 Klass* host_klass() const {
589 Klass** hk = (Klass**)adr_host_klass();
590 if (hk == NULL) {
591 assert(!is_anonymous(), "Anonymous classes have host klasses");
592 return NULL;
593 } else {
594 assert(*hk != NULL, "host klass should always be set if the address is not null");
595 assert(is_anonymous(), "Only anonymous classes have host klasses");
596 return *hk;
597 }
598 }
set_host_klass(Klass * host)599 void set_host_klass(Klass* host) {
600 assert(is_anonymous(), "not anonymous");
601 Klass** addr = (Klass**)adr_host_klass();
602 assert(addr != NULL, "no reversed space");
603 if (addr != NULL) {
604 *addr = host;
605 }
606 }
has_host_klass() const607 bool has_host_klass() const {
608 return adr_host_klass() != NULL;
609 }
is_anonymous() const610 bool is_anonymous() const {
611 return (_misc_flags & _misc_is_anonymous) != 0;
612 }
set_is_anonymous(bool value)613 void set_is_anonymous(bool value) {
614 if (value) {
615 _misc_flags |= _misc_is_anonymous;
616 } else {
617 _misc_flags &= ~_misc_is_anonymous;
618 }
619 }
620
621 // Oop that keeps the metadata for this class from being unloaded
622 // in places where the metadata is stored in other places, like nmethods
klass_holder() const623 oop klass_holder() const {
624 return is_anonymous() ? java_mirror() : class_loader();
625 }
626
is_contended() const627 bool is_contended() const {
628 return (_misc_flags & _misc_is_contended) != 0;
629 }
set_is_contended(bool value)630 void set_is_contended(bool value) {
631 if (value) {
632 _misc_flags |= _misc_is_contended;
633 } else {
634 _misc_flags &= ~_misc_is_contended;
635 }
636 }
637
638 // source file name
source_file_name() const639 Symbol* source_file_name() const {
640 return (_source_file_name_index == 0) ?
641 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
642 }
source_file_name_index() const643 u2 source_file_name_index() const {
644 return _source_file_name_index;
645 }
set_source_file_name_index(u2 sourcefile_index)646 void set_source_file_name_index(u2 sourcefile_index) {
647 _source_file_name_index = sourcefile_index;
648 }
649
650 // minor and major version numbers of class file
minor_version() const651 u2 minor_version() const { return _minor_version; }
set_minor_version(u2 minor_version)652 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
major_version() const653 u2 major_version() const { return _major_version; }
set_major_version(u2 major_version)654 void set_major_version(u2 major_version) { _major_version = major_version; }
655
656 // source debug extension
source_debug_extension() const657 char* source_debug_extension() const { return _source_debug_extension; }
658 void set_source_debug_extension(char* array, int length);
659
660 // symbol unloading support (refcount already added)
array_name()661 Symbol* array_name() { return _array_name; }
set_array_name(Symbol * name)662 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
663
664 // nonstatic oop-map blocks
nonstatic_oop_map_size(unsigned int oop_map_count)665 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
666 return oop_map_count * OopMapBlock::size_in_words();
667 }
nonstatic_oop_map_count() const668 unsigned int nonstatic_oop_map_count() const {
669 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
670 }
nonstatic_oop_map_size() const671 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
set_nonstatic_oop_map_size(int words)672 void set_nonstatic_oop_map_size(int words) {
673 _nonstatic_oop_map_size = words;
674 }
675
676 // Redefinition locking. Class can only be redefined by one thread at a time.
is_being_redefined() const677 bool is_being_redefined() const { return _is_being_redefined; }
set_is_being_redefined(bool value)678 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
679
680 // RedefineClasses() support for previous versions:
681 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
682
previous_versions() const683 InstanceKlass* previous_versions() const { return _previous_versions; }
684
has_been_redefined() const685 bool has_been_redefined() const {
686 return (_misc_flags & _misc_has_been_redefined) != 0;
687 }
set_has_been_redefined()688 void set_has_been_redefined() {
689 _misc_flags |= _misc_has_been_redefined;
690 }
691
init_previous_versions()692 void init_previous_versions() {
693 _previous_versions = NULL;
694 }
695
696
get_klass_version(int version)697 InstanceKlass* get_klass_version(int version) {
698 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
699 if (ik->constants()->version() == version) {
700 return ik;
701 }
702 }
703 return NULL;
704 }
705
706 static void purge_previous_versions(InstanceKlass* ik);
707
708 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
set_cached_class_file(JvmtiCachedClassFileData * data)709 void set_cached_class_file(JvmtiCachedClassFileData *data) {
710 _cached_class_file = data;
711 }
get_cached_class_file()712 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
713 jint get_cached_class_file_len();
714 unsigned char * get_cached_class_file_bytes();
715
716 // JVMTI: Support for caching of field indices, types, and offsets
set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap * descriptor)717 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
718 _jvmti_cached_class_field_map = descriptor;
719 }
jvmti_cached_class_field_map() const720 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
721 return _jvmti_cached_class_field_map;
722 }
723
has_default_methods() const724 bool has_default_methods() const {
725 return (_misc_flags & _misc_has_default_methods) != 0;
726 }
set_has_default_methods(bool b)727 void set_has_default_methods(bool b) {
728 if (b) {
729 _misc_flags |= _misc_has_default_methods;
730 } else {
731 _misc_flags &= ~_misc_has_default_methods;
732 }
733 }
734
declares_default_methods() const735 bool declares_default_methods() const {
736 return (_misc_flags & _misc_declares_default_methods) != 0;
737 }
set_declares_default_methods(bool b)738 void set_declares_default_methods(bool b) {
739 if (b) {
740 _misc_flags |= _misc_declares_default_methods;
741 } else {
742 _misc_flags &= ~_misc_declares_default_methods;
743 }
744 }
745
746 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
747 inline u2 next_method_idnum();
set_initial_method_idnum(u2 value)748 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
749
750 // generics support
generic_signature() const751 Symbol* generic_signature() const {
752 return (_generic_signature_index == 0) ?
753 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
754 }
generic_signature_index() const755 u2 generic_signature_index() const {
756 return _generic_signature_index;
757 }
set_generic_signature_index(u2 sig_index)758 void set_generic_signature_index(u2 sig_index) {
759 _generic_signature_index = sig_index;
760 }
761
762 u2 enclosing_method_data(int offset);
enclosing_method_class_index()763 u2 enclosing_method_class_index() {
764 return enclosing_method_data(enclosing_method_class_index_offset);
765 }
enclosing_method_method_index()766 u2 enclosing_method_method_index() {
767 return enclosing_method_data(enclosing_method_method_index_offset);
768 }
769 void set_enclosing_method_indices(u2 class_index,
770 u2 method_index);
771
772 // jmethodID support
773 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
774 methodHandle method_h);
775 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
776 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
777 jmethodID* to_dealloc_id_p,
778 jmethodID** to_dealloc_jmeths_p);
779 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
780 size_t *length_p, jmethodID* id_p);
781 jmethodID jmethod_id_or_null(Method* method);
782
783 // annotations support
annotations() const784 Annotations* annotations() const { return _annotations; }
set_annotations(Annotations * anno)785 void set_annotations(Annotations* anno) { _annotations = anno; }
786
class_annotations() const787 AnnotationArray* class_annotations() const {
788 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
789 }
fields_annotations() const790 Array<AnnotationArray*>* fields_annotations() const {
791 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
792 }
class_type_annotations() const793 AnnotationArray* class_type_annotations() const {
794 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
795 }
fields_type_annotations() const796 Array<AnnotationArray*>* fields_type_annotations() const {
797 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
798 }
799 // allocation
800 instanceOop allocate_instance(TRAPS);
801
802 // additional member function to return a handle
allocate_instance_handle(TRAPS)803 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
804
805 objArrayOop allocate_objArray(int n, int length, TRAPS);
806 // Helper function
807 static instanceOop register_finalizer(instanceOop i, TRAPS);
808
809 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
810 // if not, throw either an Error or an Exception.
811 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
812
813 // initialization
814 void call_class_initializer(TRAPS);
815 void set_initialization_state_and_notify(ClassState state, TRAPS);
816
817 // OopMapCache support
oop_map_cache()818 OopMapCache* oop_map_cache() { return _oop_map_cache; }
set_oop_map_cache(OopMapCache * cache)819 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
820 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
821
822 // JNI identifier support (for static fields - for jni performance)
jni_ids()823 JNIid* jni_ids() { return _jni_ids; }
set_jni_ids(JNIid * ids)824 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
825 JNIid* jni_id_for(int offset);
826
827 // maintenance of deoptimization dependencies
828 int mark_dependent_nmethods(DepChange& changes);
829 void add_dependent_nmethod(nmethod* nm);
830 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
831
832 // On-stack replacement support
osr_nmethods_head() const833 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
set_osr_nmethods_head(nmethod * h)834 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
835 void add_osr_nmethod(nmethod* n);
836 void remove_osr_nmethod(nmethod* n);
837 int mark_osr_nmethods(const Method* m);
838 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
839
840 // Breakpoint support (see methods on Method* for details)
breakpoints() const841 BreakpointInfo* breakpoints() const { return _breakpoints; };
set_breakpoints(BreakpointInfo * bps)842 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
843
844 // support for stub routines
init_state_offset()845 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)846 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
847 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
848
849 // subclass/subinterface checks
850 bool implements_interface(Klass* k) const;
851 bool is_same_or_direct_interface(Klass* k) const;
852
853 #ifdef ASSERT
854 // check whether this class or one of its superclasses was redefined
855 bool has_redefined_this_or_super() const;
856 #endif
857
858 // Access to the implementor of an interface.
implementor() const859 Klass* implementor() const
860 {
861 Klass** k = adr_implementor();
862 if (k == NULL) {
863 return NULL;
864 } else {
865 return *k;
866 }
867 }
868
set_implementor(Klass * k)869 void set_implementor(Klass* k) {
870 assert(is_interface(), "not interface");
871 Klass** addr = adr_implementor();
872 assert(addr != NULL, "null addr");
873 if (addr != NULL) {
874 *addr = k;
875 }
876 }
877
nof_implementors() const878 int nof_implementors() const {
879 Klass* k = implementor();
880 if (k == NULL) {
881 return 0;
882 } else if (k != this) {
883 return 1;
884 } else {
885 return 2;
886 }
887 }
888
889 void add_implementor(Klass* k); // k is a new class that implements this interface
890 void init_implementor(); // initialize
891
892 // link this class into the implementors list of every interface it implements
893 void process_interfaces(Thread *thread);
894
895 // virtual operations from Klass
is_leaf_class() const896 bool is_leaf_class() const { return _subklass == NULL; }
897 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
898 bool compute_is_subtype_of(Klass* k);
899 bool can_be_primary_super_slow() const;
oop_size(oop obj) const900 int oop_size(oop obj) const { return size_helper(); }
oop_is_instance_slow() const901 bool oop_is_instance_slow() const { return true; }
902
903 // Iterators
904 void do_local_static_fields(FieldClosure* cl);
905 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
906 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
907
908 void methods_do(void f(Method* method));
909 void array_klasses_do(void f(Klass* k));
910 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
911 bool super_types_do(SuperTypeClosure* blk);
912
913 // Casting from Klass*
cast(Klass * k)914 static InstanceKlass* cast(Klass* k) {
915 assert(k == NULL || k->is_klass(), "must be");
916 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
917 return (InstanceKlass*) k;
918 }
919
java_super() const920 InstanceKlass* java_super() const {
921 return (super() == NULL) ? NULL : cast(super());
922 }
923
924 // Sizing (in words)
header_size()925 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
926
size(int vtable_length,int itable_length,int nonstatic_oop_map_size,bool is_interface,bool is_anonymous)927 static int size(int vtable_length, int itable_length,
928 int nonstatic_oop_map_size,
929 bool is_interface, bool is_anonymous) {
930 return align_object_size(header_size() +
931 align_object_offset(vtable_length) +
932 align_object_offset(itable_length) +
933 ((is_interface || is_anonymous) ?
934 align_object_offset(nonstatic_oop_map_size) :
935 nonstatic_oop_map_size) +
936 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
937 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
938 }
size() const939 int size() const { return size(vtable_length(),
940 itable_length(),
941 nonstatic_oop_map_size(),
942 is_interface(),
943 is_anonymous());
944 }
945 #if INCLUDE_SERVICES
946 virtual void collect_statistics(KlassSizeStats *sz) const;
947 #endif
948
vtable_start_offset()949 static int vtable_start_offset() { return header_size(); }
vtable_length_offset()950 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
951
start_of_vtable() const952 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
start_of_itable() const953 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
itable_offset_in_words() const954 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
955
end_of_itable() const956 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
957
958 address static_field_addr(int offset);
959
start_of_nonstatic_oop_maps() const960 OopMapBlock* start_of_nonstatic_oop_maps() const {
961 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
962 }
963
end_of_nonstatic_oop_maps() const964 Klass** end_of_nonstatic_oop_maps() const {
965 return (Klass**)(start_of_nonstatic_oop_maps() +
966 nonstatic_oop_map_count());
967 }
968
adr_implementor() const969 Klass** adr_implementor() const {
970 if (is_interface()) {
971 return (Klass**)end_of_nonstatic_oop_maps();
972 } else {
973 return NULL;
974 }
975 };
976
adr_host_klass() const977 Klass** adr_host_klass() const {
978 if (is_anonymous()) {
979 Klass** adr_impl = adr_implementor();
980 if (adr_impl != NULL) {
981 return adr_impl + 1;
982 } else {
983 return end_of_nonstatic_oop_maps();
984 }
985 } else {
986 return NULL;
987 }
988 }
989
990 // Use this to return the size of an instance in heap words:
size_helper() const991 int size_helper() const {
992 return layout_helper_to_size_helper(layout_helper());
993 }
994
995 // This bit is initialized in classFileParser.cpp.
996 // It is false under any of the following conditions:
997 // - the class is abstract (including any interface)
998 // - the class has a finalizer (if !RegisterFinalizersAtInit)
999 // - the class size is larger than FastAllocateSizeLimit
1000 // - the class is java/lang/Class, which cannot be allocated directly
can_be_fastpath_allocated() const1001 bool can_be_fastpath_allocated() const {
1002 return !layout_helper_needs_slow_path(layout_helper());
1003 }
1004
1005 // Java vtable/itable
1006 klassVtable* vtable() const; // return new klassVtable wrapper
1007 inline Method* method_at_vtable(int index);
1008 klassItable* itable() const; // return new klassItable wrapper
1009 Method* method_at_itable(Klass* holder, int index, TRAPS);
1010
1011 #if INCLUDE_JVMTI
1012 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1013 #endif // INCLUDE_JVMTI
1014
1015 // Garbage collection
1016 void oop_follow_contents(oop obj);
1017 int oop_adjust_pointers(oop obj);
1018
1019 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1020 void clean_implementors_list(BoolObjectClosure* is_alive);
1021 void clean_method_data(BoolObjectClosure* is_alive);
1022 void clean_dependent_nmethods();
1023
1024 // Explicit metaspace deallocation of fields
1025 // For RedefineClasses and class file parsing errors, we need to deallocate
1026 // instanceKlasses and the metadata they point to.
1027 void deallocate_contents(ClassLoaderData* loader_data);
1028 static void deallocate_methods(ClassLoaderData* loader_data,
1029 Array<Method*>* methods);
1030 void static deallocate_interfaces(ClassLoaderData* loader_data,
1031 Klass* super_klass,
1032 Array<Klass*>* local_interfaces,
1033 Array<Klass*>* transitive_interfaces);
1034
1035 // The constant pool is on stack if any of the methods are executing or
1036 // referenced by handles.
on_stack() const1037 bool on_stack() const { return _constants->on_stack(); }
1038
1039 // callbacks for actions during class unloading
1040 static void notify_unload_class(InstanceKlass* ik);
1041 static void release_C_heap_structures(InstanceKlass* ik);
1042
1043 // Parallel Scavenge and Parallel Old
1044 PARALLEL_GC_DECLS
1045
1046 // Naming
1047 const char* signature_name() const;
1048
1049 // Iterators
oop_oop_iterate(oop obj,ExtendedOopClosure * blk)1050 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
1051 return oop_oop_iterate_v(obj, blk);
1052 }
1053
oop_oop_iterate_m(oop obj,ExtendedOopClosure * blk,MemRegion mr)1054 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
1055 return oop_oop_iterate_v_m(obj, blk, mr);
1056 }
1057
1058 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
1059 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
1060 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
1061 MemRegion mr);
1062
1063 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)1064 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
1065
1066 #if INCLUDE_ALL_GCS
1067 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
1068 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
1069
1070 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1071 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1072 #endif // INCLUDE_ALL_GCS
1073
1074 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1075
1076 public:
set_in_error_state()1077 void set_in_error_state() {
1078 assert(DumpSharedSpaces, "only call this when dumping archive");
1079 _init_state = initialization_error;
1080 }
1081 bool check_sharing_error_state();
1082
1083 private:
1084 // initialization state
1085 #ifdef ASSERT
1086 void set_init_state(ClassState state);
1087 #else
1088 void set_init_state(ClassState state) { _init_state = (u1)state; }
1089 #endif
set_rewritten()1090 void set_rewritten() { _misc_flags |= _misc_rewritten; }
set_init_thread(Thread * thread)1091 void set_init_thread(Thread *thread) { _init_thread = thread; }
1092
1093 // The RedefineClasses() API can cause new method idnums to be needed
1094 // which will cause the caches to grow. Safety requires different
1095 // cache management logic if the caches can grow instead of just
1096 // going from NULL to non-NULL.
idnum_can_increment() const1097 bool idnum_can_increment() const { return has_been_redefined(); }
methods_jmethod_ids_acquire() const1098 jmethodID* methods_jmethod_ids_acquire() const
1099 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
release_set_methods_jmethod_ids(jmethodID * jmeths)1100 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1101 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1102
1103 // Lock during initialization
1104 public:
1105 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1106 // Must be one per class and it has to be a VM internal object so java code
1107 // cannot lock it (like the mirror).
1108 // It has to be an object not a Mutex because it's held through java calls.
1109 oop init_lock() const;
1110 private:
1111 void fence_and_clear_init_lock();
1112
1113 // Static methods that are used to implement member methods where an exposed this pointer
1114 // is needed due to possible GCs
1115 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1116 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1117 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1118 static void initialize_super_interfaces (instanceKlassHandle this_oop, TRAPS);
1119 static void eager_initialize_impl (instanceKlassHandle this_oop);
1120 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1121 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1122 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1123 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1124 /* jni_id_for_impl for jfieldID only */
1125 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1126
1127 // Returns the array class for the n'th dimension
1128 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1129
1130 // Returns the array class with this class as element type
1131 Klass* array_klass_impl(bool or_null, TRAPS);
1132
1133 // find a local method (returns NULL if not found)
1134 Method* find_method_impl(Symbol* name, Symbol* signature,
1135 OverpassLookupMode overpass_mode,
1136 StaticLookupMode static_mode,
1137 PrivateLookupMode private_mode) const;
1138 static Method* find_method_impl(Array<Method*>* methods,
1139 Symbol* name, Symbol* signature,
1140 OverpassLookupMode overpass_mode,
1141 StaticLookupMode static_mode,
1142 PrivateLookupMode private_mode);
1143
1144 // Free CHeap allocated fields.
1145 void release_C_heap_structures();
1146
1147 // RedefineClasses support
link_previous_versions(InstanceKlass * pv)1148 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1149 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1150 public:
1151 // CDS support - remove and restore oops from metadata. Oops are not shared.
1152 virtual void remove_unshareable_info();
1153 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1154
1155 // jvm support
1156 jint compute_modifier_flags(TRAPS) const;
1157
1158 // JSR-292 support
member_names()1159 MemberNameTable* member_names() { return _member_names; }
set_member_names(MemberNameTable * member_names)1160 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1161 oop add_member_name(Handle member_name, bool intern);
1162
1163 public:
1164 // JVMTI support
1165 jint jvmti_class_status() const;
1166
1167 public:
1168 // Printing
1169 #ifndef PRODUCT
1170 void print_on(outputStream* st) const;
1171 #endif
1172 void print_value_on(outputStream* st) const;
1173
1174 void oop_print_value_on(oop obj, outputStream* st);
1175
1176 #ifndef PRODUCT
1177 void oop_print_on (oop obj, outputStream* st);
1178
1179 void print_dependent_nmethods(bool verbose = false);
1180 bool is_dependent_nmethod(nmethod* nm);
1181 #endif
1182
1183 const char* internal_name() const;
1184
1185 // Verification
1186 void verify_on(outputStream* st);
1187
1188 void oop_verify_on(oop obj, outputStream* st);
1189 };
1190
method_at_vtable(int index)1191 inline Method* InstanceKlass::method_at_vtable(int index) {
1192 #ifndef PRODUCT
1193 assert(index >= 0, "valid vtable index");
1194 if (DebugVtables) {
1195 verify_vtable_index(index);
1196 }
1197 #endif
1198 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1199 return ve[index].method();
1200 }
1201
1202 // for adding methods
1203 // UNSET_IDNUM return means no more ids available
next_method_idnum()1204 inline u2 InstanceKlass::next_method_idnum() {
1205 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1206 return ConstMethod::UNSET_IDNUM; // no more ids available
1207 } else {
1208 return _idnum_allocated_count++;
1209 }
1210 }
1211
1212
1213 /* JNIid class for jfieldIDs only */
1214 class JNIid: public CHeapObj<mtClass> {
1215 friend class VMStructs;
1216 private:
1217 Klass* _holder;
1218 JNIid* _next;
1219 int _offset;
1220 #ifdef ASSERT
1221 bool _is_static_field_id;
1222 #endif
1223
1224 public:
1225 // Accessors
holder() const1226 Klass* holder() const { return _holder; }
offset() const1227 int offset() const { return _offset; }
next()1228 JNIid* next() { return _next; }
1229 // Constructor
1230 JNIid(Klass* holder, int offset, JNIid* next);
1231 // Identifier lookup
1232 JNIid* find(int offset);
1233
find_local_field(fieldDescriptor * fd)1234 bool find_local_field(fieldDescriptor* fd) {
1235 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1236 }
1237
1238 static void deallocate(JNIid* id);
1239 // Debugging
1240 #ifdef ASSERT
is_static_field_id() const1241 bool is_static_field_id() const { return _is_static_field_id; }
set_is_static_field_id()1242 void set_is_static_field_id() { _is_static_field_id = true; }
1243 #endif
1244 void verify(Klass* holder);
1245 };
1246
1247
1248 //
1249 // nmethodBucket is used to record dependent nmethods for
1250 // deoptimization. nmethod dependencies are actually <klass, method>
1251 // pairs but we really only care about the klass part for purposes of
1252 // finding nmethods which might need to be deoptimized. Instead of
1253 // recording the method, a count of how many times a particular nmethod
1254 // was recorded is kept. This ensures that any recording errors are
1255 // noticed since an nmethod should be removed as many times are it's
1256 // added.
1257 //
1258 class nmethodBucket: public CHeapObj<mtClass> {
1259 friend class VMStructs;
1260 private:
1261 nmethod* _nmethod;
1262 int _count;
1263 nmethodBucket* _next;
1264
1265 public:
nmethodBucket(nmethod * nmethod,nmethodBucket * next)1266 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1267 _nmethod = nmethod;
1268 _next = next;
1269 _count = 1;
1270 }
count()1271 int count() { return _count; }
increment()1272 int increment() { _count += 1; return _count; }
1273 int decrement();
next()1274 nmethodBucket* next() { return _next; }
set_next(nmethodBucket * b)1275 void set_next(nmethodBucket* b) { _next = b; }
get_nmethod()1276 nmethod* get_nmethod() { return _nmethod; }
1277 };
1278
1279 // An iterator that's used to access the inner classes indices in the
1280 // InstanceKlass::_inner_classes array.
1281 class InnerClassesIterator : public StackObj {
1282 private:
1283 Array<jushort>* _inner_classes;
1284 int _length;
1285 int _idx;
1286 public:
1287
InnerClassesIterator(instanceKlassHandle k)1288 InnerClassesIterator(instanceKlassHandle k) {
1289 _inner_classes = k->inner_classes();
1290 if (k->inner_classes() != NULL) {
1291 _length = _inner_classes->length();
1292 // The inner class array's length should be the multiple of
1293 // inner_class_next_offset if it only contains the InnerClasses
1294 // attribute data, or it should be
1295 // n*inner_class_next_offset+enclosing_method_attribute_size
1296 // if it also contains the EnclosingMethod data.
1297 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1298 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1299 "just checking");
1300 // Remove the enclosing_method portion if exists.
1301 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1302 _length -= InstanceKlass::enclosing_method_attribute_size;
1303 }
1304 } else {
1305 _length = 0;
1306 }
1307 _idx = 0;
1308 }
1309
length() const1310 int length() const {
1311 return _length;
1312 }
1313
next()1314 void next() {
1315 _idx += InstanceKlass::inner_class_next_offset;
1316 }
1317
done() const1318 bool done() const {
1319 return (_idx >= _length);
1320 }
1321
inner_class_info_index() const1322 u2 inner_class_info_index() const {
1323 return _inner_classes->at(
1324 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1325 }
1326
set_inner_class_info_index(u2 index)1327 void set_inner_class_info_index(u2 index) {
1328 _inner_classes->at_put(
1329 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1330 }
1331
outer_class_info_index() const1332 u2 outer_class_info_index() const {
1333 return _inner_classes->at(
1334 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1335 }
1336
set_outer_class_info_index(u2 index)1337 void set_outer_class_info_index(u2 index) {
1338 _inner_classes->at_put(
1339 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1340 }
1341
inner_name_index() const1342 u2 inner_name_index() const {
1343 return _inner_classes->at(
1344 _idx + InstanceKlass::inner_class_inner_name_offset);
1345 }
1346
set_inner_name_index(u2 index)1347 void set_inner_name_index(u2 index) {
1348 _inner_classes->at_put(
1349 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1350 }
1351
inner_access_flags() const1352 u2 inner_access_flags() const {
1353 return _inner_classes->at(
1354 _idx + InstanceKlass::inner_class_access_flags_offset);
1355 }
1356 };
1357
1358 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP
1359